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changes to queue processing timeouts after errors - should be friendlier to the servers when things fail

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This commit is contained in:
Jon Atkins 2014-03-18 22:16:20 +00:00
parent df4bf0bbc0
commit 584b8bcd72
1 changed files with 20 additions and 24 deletions
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44
code/map_data_request.js
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@ -38,15 +38,14 @@ window.MapDataRequest = function() {
// a short delay between one request finishing and the queue being run for the next request.
// this gives a chance of other requests finishing, allowing better grouping of retries in new requests
this.RUN_QUEUE_DELAY = 0.5;
this.RUN_QUEUE_DELAY = 0.2;
// delay before requeuing tiles in failed requests
this.BAD_REQUEST_REQUEUE_DELAY = 10; // longer delay before retrying a completely failed request - as in this case the servers are struggling
// delay before processing the queue after failed requests
this.BAD_REQUEST_RUN_QUEUE_DELAY = 10; // longer delay before doing anything after errors (other than TIMEOUT)
// delay before processing the queue after error==TIMEOUT requests. this is a less severe error than other errors
this.TIMEOUT_REQUEST_RUN_QUEUE_DELAY = 2;
// a delay before processing the queue after requeuing tiles. this gives a chance for other requests to finish
// or other requeue actions to happen before the queue is processed, allowing better grouping of requests
// however, the queue may be processed sooner if a previous timeout was set
this.REQUEUE_DELAY = 1;
this.REFRESH_CLOSE = 120; // refresh time to use for close views z>12 when not idle and not moving
@ -248,7 +247,8 @@ window.MapDataRequest.prototype.refresh = function() {
//TODO: with recent backend changes there are now multiple zoom levels of data that is identical except perhaps for some
// reduction of detail when zoomed out. to take good advantage of the cache, a check for cached data at a closer zoom
// but otherwise the same parameters (min portal level, tiles per edge) will mean less downloads when zooming out
// (however, the default code in getDataZoomForMapZoom currently reduces the need for this, as it forces the furthest
// out zoom tiles for a detail level)
if (this.cache && this.cache.isFresh(tile_id) ) {
// data is fresh in the cache - just render it
this.debugTiles.setState(tile_id, 'cache-fresh');
@ -532,9 +532,12 @@ window.MapDataRequest.prototype.handleResponse = function (data, tiles, success)
window.runHooks('requestFinished', {success: true});
}
// set the queue delay based on any errors or timeouts
var nextQueueDelay = errorTiles.length > 0 ? this.BAD_REQUEST_RUN_QUEUE_DELAY :
timeoutTiles.length > 0 ? this.TIMEOUT_REQUEST_RUN_QUEUE_DELAY :
this.RUN_QUEUE_DELAY;
console.log ('getThinnedEntities status: '+tiles.length+' tiles: '+successTiles.length+' successful, '+timeoutTiles.length+' timed out, '+errorTiles.length+' failed');
console.log ('getThinnedEntities status: '+tiles.length+' tiles: '+successTiles.length+' successful, '+timeoutTiles.length+' timed out, '+errorTiles.length+' failed. delay '+nextQueueDelay+' seconds');
// requeue any 'timeout' tiles immediately
if (timeoutTiles.length > 0) {
@ -545,27 +548,20 @@ window.MapDataRequest.prototype.handleResponse = function (data, tiles, success)
}
}
// but for other errors, delay before retrying (as the server is having issues)
if (errorTiles.length > 0) {
//setTimeout has no way of passing the 'context' (aka 'this') to it's function
var savedContext = this;
setTimeout (function() {
for (var i in errorTiles) {
var id = errorTiles[i];
delete savedContext.requestedTiles[id];
savedContext.requeueTile(id, true);
}
savedContext.delayProcessRequestQueue(this.REQUEUE_DELAY);
}, this.BAD_REQUEST_REQUEUE_DELAY*1000);
for (var i in errorTiles) {
var id = errorTiles[i];
delete this.requestedTiles[id];
this.requeueTile(id, true);
}
}
for (var i in successTiles) {
var id = successTiles[i];
delete this.requestedTiles[id];
}
//.. should this also be delayed a small amount?
this.delayProcessRequestQueue(this.RUN_QUEUE_DELAY);
this.delayProcessRequestQueue(nextQueueDelay);
}